Mg2+ Determination using EDTA Linh Nguyen Chem 1212L – 165 Feb 08 ‚ 2014 Purpose and Procedure: The purpose of this experiment is using Compleximetric titration and EDTA to determine the concentration of Mg2+ in solution; and also calculating the percent by mass of MgO in the unknown sample. This procedure results no significant deviations. The procedure for the experiment is from the lab manual referenced below Laboratory Experiments for Chem 1211L & 1212L (6e)
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Project on Saturated Solutions: Measuring Solubility iC BS E.c om Index 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. Certificate Acknowledgement Objective Introduction Basic concepts Materials and Equipment Experimental Procedure Observation Conclusion Result Precautions Bibliography iC BS E .co m CERTIFICATE This is to certify that the Project titled ’Saturated solutions: Measuring Solubility ’ was completed under my guidance and supervision by Roll No. ________
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measuring the absorbance‚ the concentration of a chemical substance can be determined. For the calibration of the colorimeter‚ different concentrations of a standard solution and a control (distilled water) are prepared in cuvettes. These cuvettes are put into the colorimeter one by one to calibrate it. After the colorimeter is calibrated‚ solutions of the substances which their concentrations are wanted to be determined‚ are put into cuvettes and their concentrations can be determined by this process (Dubey
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CHEM 3411‚ Fall 2010 Solution Set 5 In this solution set‚ an underline is used to show the last significant digit of numbers. For instance in x = 2.51693 the 2‚5‚1‚ and 6 are all significant. Digits to the right of the underlined digit‚ the 9 & 3 in the example‚ are not significant and would be rounded off at the end of calculations. Carrying these extra digits for intermediate values in calculations reduces rounding errors and ensures we get the same answer regardless of the order of arithmetic
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properties In liquid solutions‚ particles are close together and the solute molecules or ions disrupt intermolecular forces between the solvent molecules‚ causing changes in those properties of the solvent that depend in intermolecular attraction. For example‚ the freezing point of a solution is lower than that of the of the pure solvent and the boiling point is higher. Colligative properties of solution are those that depend on the concentration of solute particles in the solution‚ regardless of what
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carbonate solution and pH indicator phenolphthalein will be added ahead of lipase enzyme; when the pH is below 8.2‚ phenolphthalein will turn from pink to colourless. Sodium carbonate solution is added in order to turn the solution alkaline and the indicator pink then back to colourless after lipase is added to catalyse the chemical reaction and speed up the breakdown of lipids into fatty acid in the milk. Fatty acid produced then is going to neutralise the solution with sodium carbonate solution added
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substances in solution. It compares the colors of a known and an unknown solution‚ that comparison then leads to a quantitative estimate of the concentration of trace amounts of colored materials in that solution. Chemicals and Materials 40 mL standard Tartrazine solution Yellow Dye Safety goggles 100 mL beaker De-ionized water Cuvette Lint-free Tissue Gloves (Latex-free) Spectrometer with Labquest Logger-Pro USB drive Procedure Acquire 40mL of the standard tartrazine solution in a 100mL
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rn of the polynomial we can construct the solutions y1 ‚ . . . ‚ yn ‚ such as y1 = er1 x . We can also rewrite the equation in a weird-looking but useful way‚ using the symbol d D = dx . Examples: equation: y − 5y + 6y = 0. polynomial: r2 − 5r + 6 = 0. (factored): (r − 2)(r − 3) = 0. roots: 2‚ 3 weird-looking form of equation: (D − 2)(D − 3)y = 0 or (D2 − 5D + 6)y = 0. linearly independent solutions: y1 = e2x ‚ y2 = e3x . general solution: y = c1 e2x + c2 e3x . equation: y + 10y +
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concentration of the unknown bromophenol blue solutions. 4. To determine the concentration of two different solutes‚ bromophenol blue and methyl orange in a mixture. Materials and Methods: Refer to Biological Science practical manual page 5-11. Results: Part 1: Determination of Amax of bromophenol blue The wavelength with maximum absorbance reading form the graph is 590nm. Part 2: The effect of concentration on absorbance of bromophenol blue solution Tube 1 2 3 4 5 6 Distilled water (ml) 2.5
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a calibration curve we would make solutions of different concentrations of ethanol. Using a 25cm3 volumetric flask we would put 10cm3 of 25% Propanol into each one which would act as an internal standard. We would then add differing amounts of ethanol (0.5 cm3‚ 1.0cm3‚ 2.0cm3and 4.0cm3) and then top the volumetric flask up with distilled water. These would act as our standards to create a calibration curve. These standards are shown below in Table 1.0 Solution number | Volume of 25% propanol (cm3)
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